GENERA OR FAMILIES. 29 



(10) Arabis pods linear, compressed ; valves nearly flat, with a 



prominent rib. 



(11) Cardamine pods linear, compressed ; valves nerveless. 



(12) Alliaria pods linear, terete, the valves convex 3-ribbed; 



stalk of the seed flattened and winged. 



(13) Dentaria pods narrow-lanceolate, tapering, compressed ; 



valves flat, nerveless. 



** Pod siliculose, less than three times as long as broad. 



t Pod (or pouch) dorsally compressed, the valves parallel 

 to the broad partition . 



(14) Draba pouch oval or oblong, compressed; cells many- 



seeded ; filaments simple. 



(15) Alyssum pouch roundish or oval, compressed ; cells two- 



seeded ; filaments toothed or winged near the base. 



ft Pod (or pouch) laterally compressed at right-angles to 

 the narrow partition, the valves keeled. 



(16) Hutchinsia pouch elliptical, entire ; cells two-seeded. 



(17) Teesdalia pouch emarginate, the valves narrowly winged ; 



cells two-seeded ; filaments with a scale-like appendage near 

 the base. 



(18) Thlaspi pouch emarginate ; the valves broadly winged ; 



cells many-seeded ; filaments simple. 



4. Violaceous Plants. VIOLACE.E. 



(19) Viola lower petal and filaments of the two lower stamens 



spurred. 



5. Caryophyllaceous Plants. CARYOPHYLLACE.E. 



* Sepals united into a cylindrical tube. 



(20) Lychnis styles five, rarely four ; capsule opening in 5-10 



teeth at top. 



